Siemens 3WJ Air Circuit Breaker (ACB) – Microprocessor
Based Trip Unit – 3WJ1240-2AF61-1AA0
The Siemens 3WJ1240-2AF61-1AA0 is a SENTRON /
SINOVA 3WJ series Air Circuit Breaker (ACB) designed for high-capacity
low-voltage power distribution systems such as PCC panels, main LT
switchboards, industrial plants, data centers, and infrastructure installations.
It is used where high fault-level protection, system selectivity, and
reliable switching of large electrical loads are required.
This model belongs to the 3WJ1240 frame size (4000A
class) and is equipped with a microprocessor-based electronic trip unit
(ETU360WJ class) that provides advanced protection functions including overload
(L), short-time delay (S), instantaneous (I), and earth fault (G) with
fully adjustable settings for precise coordination and system protection.
It is a 3-pole ACB with 4000A rated current and 55kA
breaking capacity at 440V AC, making it suitable for heavy-duty
industrial and commercial power distribution systems with high fault levels
and continuous load demand.
Key Features
|
Parameter |
Specification |
|
Product Model |
3WJ1240-2AF61-1AA0 |
|
Brand |
Siemens |
|
Series |
SINOVA / SENTRON 3WJ |
|
Type |
Air Circuit Breaker (ACB) |
|
Frame Size |
3WJ1240 |
|
Rated Current |
4000 A |
|
Number of Poles |
3 Pole |
|
Breaking Capacity (Icu) |
55 kA @ 440 V AC |
|
Rated Voltage |
440 V AC |
|
Frequency |
50/60 Hz |
|
Protection Type |
Overload, short-circuit, earth fault |
|
Trip Unit |
Microprocessor-based ETU360WJ |
|
Mounting Type |
Fixed / withdrawable (variant dependent) |
|
Standards |
IEC 60947-2 |
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